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FZJ-2019-01478

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Untersuchungen der ternären Legierungssysteme Al-Ni-Fe und Al-Cu-Ru unter besonderer Berücksichtigung quasikristalliner Phasen

Lemmerz, U. (Corresponding author)FZJ*

1996
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/21672

Report No.: Juel-3243

Abstract: Two temary alloy-systems, the Al-Ni-Fe system and the Al-Cu-Ru system were studied with special regard to quasicrystalline phases. Isothermal sections were established in both systems in the stoichiometric area ofthe quasicrystalline phase. In the Al-Ni-Fe system a new stable decagonal phase was found. Its stoichiometric range is very small around Al$_{71.6}$Ni$_{23.0}$Fe$_{5.4}$. The temperature range in which it is stable lies between 847° and 930°C. The decagonal phase undergoes a eutectoid re action to the three crystalline phases Al$_{3}$Ni$_{2}$, Al$_{3}$Ni and Al$_{13}$Fe$_{4}$ at 847°C. It melts peritectically at 930°C forming Al$_{13}$Fe$_{4}$, Al$_{3}$Ni$_{2}$ and a liquid. The investigations in the Al-Cu-Ru system concentrated on the phase equilibria between the icosahedral phase and its neighbouring phases in a temperature range between 600° and 1000°C. The icosahedral phase was observed in the whole temperature range. The investigated stoichiometric area extends down to Al contents of 45%, which allows the fields of existence to be determined for the temary phases $\alpha$-AlCuRu, the icosahedral phase and Al$_{7}$Cu$_{2}$Ru. Binary phases were determined down to the upper (high Al content) border of AlRu. No hitherto unknown phase was observed in the investigated area. Rietveld analyses were carried out on $\alpha$-AlCuRu and Al$_{7}$Cu$_{2}$Ru showing some discrepancies from the $\alpha$-AlMnSi structure taken as a base for a-AlCuRu and confirming the Al$_{7}$CU$_{2}$Fe structure for Al$_{7}$Cu$_{2}$Ru.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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